Consolidated Statements of Income (Unaudited) Consolidated Statements of Income (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Interest on other borrowings	$ 3,797
Securities gains, net	3,427
Income taxes	5,199
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Derivatives [Member]
Interest on other borrowings	505
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Securities gains, net	3,427
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Income taxes	$ 1,099